Difference Between Flash Point and Fire Point
1. Definitional Differences
Flash Point: The lowest temperature at which a flammable liquid releases vapors that mix with air and ignite momentarily upon exposure to an open flame (flame extinguishes upon removal of the ignition source). For example, gasoline has a flash point of approximately -43°C, indicating high volatility and flammability.
Fire Point: The lowest temperature at which a liquid, when continuously heated, can sustain combustion for at least 5 seconds. For example, diesel has a fire point of around 220°C, requiring this temperature for stable burning.
2.Key differences
Combustion continuity: flash point is instantaneous and it will be extinguished when the fire source is removed; The ignition point keeps burning, and the ignition source can be maintained after being removed
Temperature relation: flash point is generally lower than ignition point (difference 0-20 ° C); The ignition point is generally higher than the flash point
Safety significance: flash point is used to measure the volatility and flammability of liquid; The ignition point reflects the continuous combustion capacity of liquid.
3. Application Scenarios
Flash Point: Evaluates storage and transport safety. For example, low-flash-point liquids (e.g., alcohol) require isolation from ignition sources.
Fire Point: Assesses material stability under high-temperature conditions, such as industrial equipment designs to prevent spontaneous combustion.
4. Comparative Examples
Vegetable Fuel: Low flash point (easily volatile) but high fire point (requires sustained heating), making flash point the key safety indicator.
Lubricating Oil: Both flash and fire points are high, resulting in low combustibility and better safety.
5. Testing Methods
Flash Point Measurement: Performed using open-cup or closed-cup methods to observe flash ignition.
Fire Point Measurement: Involves heating until stable combustion occurs, recording the minimum temperature.
SK107 is a fully automatic closed-cup flash point tester, which is developed by centralized surgery. The instrument adopts microcomputer technology and large-screen LCD display. The instrument is heated up, automatically raised and lowered, automatically ventilated, and automatically ignited according to the standard method, without air source, automatic display, automatic locking of flash point value, and automatic printing of results. After the test, it can automatically cool down and realize the full automation of the working process. It has the advantages of accurate measurement, good repeatability, stable performance and simple operation. It is widely used in power, petroleum, chemical, commodity inspection, scientific research and other departments. Comply with ISO-2719 and GB261-83 standards.
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